Best way to improve positional understanding

Good Positional Chess, Planning & Strategy Books for Beginners and Beyond...

https://www.chess.com/blog/RussBell/introduction-to-positional-chess-planning-strategy

Different things work for different players. One thing that helped me a lot at this stage of my chess journey was joining a local chess club. Another idea may be to play longer time controls and review chess games from strong players like grandmasters (or at least several hundred point higher than yourself). Positional motifs exist just like tactical ones do. When doing tactics, you will identify things like "pins", "forks", "skewers" etc. and positional thinking can be thought of similarly (although it seldom is) such as "placing Rooks on open files", "overloading a weakness" or creating "pawn breaks" and so on. Playing longer time control games and reviewing GM games will help give you more time and insight to look for things of positional nature. 

Good luck. I love positional games, but it takes a different way of thinking. Of course, GMs combine both tactical and positional themes in their games, but some games are predominantly one or the other

Thanks for help!

Also, doing puzzles can help too. Everyone knows about tactical puzzles, but many are calculation based like many endgame studies. 

https://www.chess.com/forum/view/game-analysis/calculation-training 

This forum has some challenging ones posted, but the discussions are worth listening to because the exchange of ideas is great for learning!

p.s. Okay, I've given lots of resources (maybe too many lol), but only because I remember learning positional ideas too and it isn't always as easy to come across as tactical themes and beginner ideas like opening principles.